Lens strap for ophthalmic mountings



Nov. 5, 1940. B. J. LOWRES 2,220,453v

LENS STRAP FOR OPHTHALMIC MOUNTINGS Filed June 15, 19 39 I) g A? W V 4 1m 2/2/22;

J INVENTOR Q96 Ber? (flow/Q55} BY I ' ATTORNEY.

Patented Nov. 5, 1940 UNITED STATES 2,220,453 LENS STRAP FOR gITHALMICMOUNT- Bert .L Lowres, East Orange, N. J.

Application June 13, 1939, Serial No. 278,850

2 Claims.

. and associated lens fastening means of such novel '10 form andcooperative association that the outwardly presented face of said strapstructure isunblemished by exposed portions of the associated lensfastening means, but rather whereby the latter are completely concealed,and the surface of the outwardly presented face of the strap structureis left either smooth and unbroken or subject to engraved ornamentationof any desired design and character.

Another object of the invention is to provide a novel lens anchoringstud and means for interlocking the same to the inner face portionof theoutwardly presented arm of the strap structure, whereby the stud may befirst assembled with a lens by insertion in the eye or attachmentopening of the latter, and then such assembly slid between and into theembrace of the strap arms while at the same time interlocking the studto the outer arm, whereupon the thus assembled parts may be securedtogether by a fastening screw adapted to pass through the perforateinner strap'arm into threaded engagement with said stud.

Other objects of this invention, not at this time,

and strap structure; Fig. 4 is a longitudinal hori-' zontal section,taken on line 4-4 in Fig. 1, but drawn on an enlarged scale; Fig. 5 is avertical longitudinal section, taken on line 55 in Fig. 3; and Fig. 6 isa longitudinal horizontal section of the parts as disposed preparatoryto assembling.

Similar characters of reference are employed in the above-describedviews, to indicate co'rresponding parts.

Referring to the drawings, the novel strap 7 structure comprises abifurcate member formed by spaced apart front and rear strap arms it andII joined at their rearward ends by a butt portion i2 adapted to extendacross the edge of a 5 lens L to which the strap structure is applied.Extending upwardly and downwardly respectively from said butt portionH2, in the plane of the lens edge, are the upper and lower abutment lugsor members 13 and I4, by which the edge of the lens L, as embraced bythe strap structure, is supported so as to hold the lens. againstrocking displacement or play. Suitably attached to and extending fromthe exterior portion of said butt portion l2 are desired elements of arimless ophthalmic mounting, such 6. g. as a center piece or bridge l5and a supporting arm is by which the nose-pad or guard ll is carried. Itwill be understood that other elements of a mounting, such as temple endpieces, etc. (not shown), may be supported from a strapgstructureaccording to this invention, where the mounting'is of a type requiringor including such elements.

The front strap arm is provided in its inner face portion with a recessor chamber it behind its outer face portion and open endwise toward thefree end of said strap arm, said chamber being bounded on its lensfacing'side with spaced upper and lower flanges l9 and 2B, the opposed,free margins of which define a slot-way 2!. The interior end of saidrecess or chamber is is terminated by a stop shoulder 22. The referencecharacter '23 indicates a stud member having an axial internallyscrewthreaded bore 24, and being further provided at one end with anenlarged, fiat plate-like head 25 of a thickness corresponding to thespace dimension of the recess or chamber l3 intermediate the outer faceportion of the strap arm l0 and the flanges I9-20. Said stud member 23is adapted for insertion through an eye or attachment opening 26 withwhich the lens L is provided; said stud being entered in said opening 26from the front face of said lens so that the head 25 of the stud memberis disposed adjacent said front face.

The rear strap arm H is provided with an opening 21, preferably having acountersunk seat 28 at its outer end. A fastening screw 29 is insertablethrough said opening 21, and is provided with a slotted head 3!] toengage said seat 28.

To assemble a lens L and the novel strap structure together, the studmember 23 is first inserted in the eye or attachment opening 26 of thelens as above described, and as shown in Fig. 6, whereupon the butt edgeof the lens is opposed to the space S (see Fig. 6) intermediate thestrap arms l and II; the stud member 23 being so disposed as to alignits head 25 with the open end of the recess or chamber l8. This havingbeen done, the lens L is thrust endwise (in the direction of the arrow:0 in Fig. 6), thereby entering the butt edge of the lens in the space Sbetween the strap arms l0 and H until stopped against the abutment lugsor members l3--|4, while at the same time the head 25 of the stud member23 is moved into the recess or chamber I8 and beneath the flangesIll-20; the shank of said stud member passing freely through theslot-way 2| between said flanges. In this manner the stud member andfront strap arm Ill are interlocked together, and the bore 24 of theformer is brought into alignment with the opening 21 of the oppositestrap arm II. The parts as thus assembled are thereupon secured againstseparation by screwing home the fastening screw 29, which is passedthrough the opening 21 of strap arm II, and screwed into the internallythreaded bore 24 of the stud member 23. Preferably said head 25 of thestud member 23 is of polygonal peripheral shape, whereby engagementthereof with the sides of the recess or chamber l8 will retain the studmember 23 against rotation when the fastening screw 29 is driven hometherein. In this manner, the respective strap arms In and I I aresecurely tied one to the other through the intermediate stud member 23,and brought into firmly embracing relation to the opposite faces of thelens L, while the latter is anchor-ed against outward displacement fromsuch relation by the stud members engagement therewith through the eyeor attachment opening 26.

It will be obvious that a very simple and easily manipulatable lensattaching and holding means is provided by the novel strap structure;while, at the same time, the front or exposed face of the outer strapmember is in no way defaced by exposure of fastening screws, rivets orlike fastening means, since the stud member 23 is interlocked with saidouter strap arm Ill in such manner as to be wholly concealed, whilenever.- theless in a manner providing a secure and emcient interlockedattachment thereto.

It will be understood that various changes could be made in the novelstrap structure of this invention without departing from the scope ofthe invention as defined by the following claims. It is thereforeintended that all matter contained in the above description or shown inthe accompanying drawing shall be interpreted as illustrative and not ina limiting sense.

I claim:

1. A lens strap structure for ophthalmic mountings comprising, spacedrigid strap arms to receive a lens therebetween, the rearwardlypresented strap arm having an opening therethrough, the outwardlypresented strap arm having an endwise open recess at the back thereof, astud member having an internally screwthreaded bore insertable into theattachment opening of the lens so as to be carried by said lens, saidstud member being of a length less than the thickness of the lens, saidstud member having at one end an enlarged head of polygonal shapeadapted to slidingly enter said recess when the lens carrying said studmember is inserted between said spaced strap arms, whereby said head isembraced and held by the sides of said recess to thereby retain saidstud member against rotative displacement, and a headed fastening screwadapted to be passed through the opening of said rearwardly presentedstrap arm to screw into the bore of said stud member.

2. A lens strap structure for ophthalmic mountings comprising, spacedfront and rear rigid strap arms to receive a lens therebetween, the rearstrap arm having an opening therethrough, the front strap arm having anendwise open recess bounded by front and rear face walls, the rear facewall of which is provided with an endwise open slot-way laterally opento said recess, a stud member having an internally screwthreadedbore anda head of polygonal shape at one end, said stud member being carried inthe attachment opening of the lens and extending from the outer faceside of the latter so as to dispose said head adjacent thereto, saidhead being adapted to enter said recess and the stud member through saidslot-way when the lens carrying said stud member is inserted between thestrap arms, whereby said head is embraced by said front strap arm recessso as to hold the same and said stud member against rotation while atthe same time concealing said head behind the front face wall of saidfront strap arm, and a fastening screw adapted to be passed through therear strap arm opening to screw into the bore of said stud member.

BERT J. LOWRES.

